In a large mixing bowl, whisk together the brown sugar, sugar, butter, and vegetable oil. Add in the egg, egg yolks, and vanilla and stir to combine. Add in the flour mixture and stir just until the flour is incorporated. Fold in the peanut butter M&M’s. Lastly, stir in the peanut butter.
1¼ cups brown sugar, ½ cup granulated sugar, ½ cup unsalted butter, ⅓ cup vegetable oil, 1 large egg, 2 egg yolks, 1 teaspoon pure vanilla extract, 1 cup peanut butter M&M’s, ½ cup creamy peanut butter